A tree native to eastern North America, Nyssa sylvatica. / Eucalyptus aggregata, of south eastern Australia / Eucalyptus ovata, of south eastern Australia

plural of black hole

Alternative form of men in black (“covert government operatives”)

(US) Any one of a series of laws, passed before the American Civil War, sharply discriminating against free blacks who wished to emigrate to a northern state and become citizens there.

(informal, idiomatic) Raw petroleum; crude oil. / Black pepper, in the context of being a historically valuable spice.

plural of black rat

A common species of rat, Rattus rattus, originating anciently in Asia but now distributed worldwide.

(martial arts) The highest belt colour in various martial arts. / (martial arts) Someone who has attained the black belt in martial arts. / (figuratively, colloquial) Great skill in any field.

(US, southern) A geographic region where the residents are predominantly or exclusively African-American.

(geology) A dark, muddy rock, rich in sulfides and organic material.